CN103500981A - Intrinsic safety correlator for connecting non-intrinsic safety circuit with ac/dc (alternating-current/direct-current) intrinsic safety circuit - Google Patents
Intrinsic safety correlator for connecting non-intrinsic safety circuit with ac/dc (alternating-current/direct-current) intrinsic safety circuit Download PDFInfo
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Abstract
The invention discloses an intrinsic safety correlator for connecting a non-intrinsic safety circuit with an ac/dc (alternating-current/direct-current) intrinsic safety circuit. The intrinsic safety correlator comprises a voltage-stabilizing power supply circuit and a signal transmission circuit, wherein the voltage-stabilizing power supply circuit comprises a power supply circuit voltage stabilizing unit, the output end of the power supply circuit voltage stabilizing unit is connected with the input end of a power supply circuit double current-limiting unit, the output end of the power supply circuit double current-limiting unit is connected with the input end of an over-current buffer unit, and the output end of the over-current buffer unit is connected with an intrinsic safety end; the signal transmission circuit comprises a signal output unit and a back current protection unit, the input end of the signal output unit is connected with the intrinsic safety end, the output end of the signal output unit is connected with a non-intrinsic safety end, the back current protection unit comprises a first back current protection circuit and a second back current protection circuit, the first back current protection circuit comprises a first double current-limiting unit, the first double current-limiting unit is connected with the non-intrinsic safety end through a first voltage-stabilizing unit, and the circuit structure of the second back current protection circuit is identical to the circuit structure of the first back current protection circuit.
Description
Technical field
The present invention relates to the colliery associate device, relate in particular to a kind of intrinsic safety correlator that connects non-intrinsically safe circuit and AC/DC intrinsically safe circuit.
Background technology
The high-grade anti-explosion product of using in easy explosive atmosphere is as the transducer of intrinsic safety type, flowmeter, sampler etc., wherein that the large or output signal of autophage power is for exchanging and the larger nonstandard product of peak value greatly, if these nonstandard products will be obtained certification of conformity of an instrument for explosive atmosphere, need to connect the intrinsic safety associate device be complementary with it.Regulation according to GB3836.4, the maximum short circuit current that intrinsic safety equipment allows under different electric pressures is different, and intrinsic safety equipment all has Power Limitation, surpasses a certain power and will ignite hazardous gas on every side and set off an explosion, so, stricter to the safety requirements of intrinsic safety equipment.
The wider intrinsic safety associate device of application is isolated gate and zena's safety barrier in the market.The advantage of isolated gate is that precision is high, but the scope of application very narrow (supply power voltage is that the 24VDC electric current is 4 ~ 20mA) can't meet the requirement of the intrinsic safety equipment of relatively high power and AC signal output; And can mate powerful zena's safety barrier, a very large shortcoming is arranged, i.e. device interior current-limiting resistance power consumption is too large, make energy all consume greatly the intrinsic safety associate device inner and can't drive the normal operation of high-power intrinsic safety equipment.Zena's safety barrier be take S2003 as example, under 28VDC voltage, when operating current is 100mA, the pressure drop of Zener grid self is that 180 Ω are multiplied by 100mA=18V, just only is left 28-18=10V to the voltage of intrinsic safety equipment power supply, intrinsic safety equipment can't be worked, when rated current is 50mA, the operating voltage of intrinsic safety equipment is 28-180x0.05=19V, and the intrinsic safety equipment that some voltage request is not high can be worked, so, the intrinsic safety equipment that the Zener grid drive can only be the product that rated current is less than 50mA.And zena's safety barrier output signal error is very large, at present zena's safety barrier because energy consumption is large, error is large, fragilely be eliminated gradually.
Summary of the invention
The purpose of this invention is to provide a kind of intrinsic safety correlator that connects non-intrinsically safe circuit and AC/DC intrinsically safe circuit, not only go for AC/DC intrinsically safe circuit output equipment, also be applicable to high-power intrinsically safe circuit output equipment.
The technical solution used in the present invention is:
A kind of intrinsic safety correlator that connects non-intrinsically safe circuit and AC/DC intrinsically safe circuit, comprise voltage stabilizing power supplying circuit and signal delivery circuit, the input of voltage stabilizing power supplying circuit is for connecting non-intrinsic safety end, the output of voltage stabilizing power supplying circuit is for connecting the intrinsic safety end, the output of signal delivery circuit is for connecting non-intrinsic safety end, and the input of signal delivery circuit is for connecting the intrinsic safety end; Described voltage stabilizing power supplying circuit comprises for the circuit voltage regulation unit, output for the circuit voltage regulation unit connects the input for the dual current limliting of circuit unit, the input that connects the overcurrent buffer cell for the output of the dual current limliting of circuit unit, the output of overcurrent buffer cell connects the intrinsic safety end; Described signal delivery circuit comprises signal output unit and back flow protection unit; the input of signal output unit connects the intrinsic safety end; the output of signal output unit connects non-intrinsic safety end; the back flow protection unit comprises the first back flow protection circuit and the second back flow protection circuit; the first back flow protection circuit comprises the first dual current limliting unit; the first dual current limliting unit connects non-intrinsic safety end by the first voltage regulation unit, and the circuit structure of the second back flow protection circuit is identical with the circuit structure of the first back flow protection circuit.
The described circuit voltage regulation unit that supplies comprises the first fuse, and the first end of the first fuse connects non-intrinsic safety end, and the second end connects the negative electrode of the voltage stabilizing didoe of three parallel connections, the plus earth of the voltage stabilizing didoe of three parallel connections.
The described dual current limliting of the circuit unit that supplies comprises for circuit elementary current limliting unit with for the secondary current limliting of circuit unit, comprise the first sample resistance for the elementary current limliting of circuit unit, the first end of the first sample resistance connects the second end of the first fuse, the second end of the first sample resistance connects the emitter of the first triode, the base stage of the first triode is by the first grounding through resistance, the first diode and the series connection of the second diode, the first end of anodic bonding first sample resistance of the first diode, the negative electrode of the second diode connects the base stage of the first triode, the collector electrode of the first triode connects the grid of the first field effect transistor by the second sample resistance, the source electrode of the first field effect transistor is by the second grounding through resistance, the base stage of the second triode connects the second end of the second sample resistance by the 3rd resistance, the emitter of the second triode connects the collector electrode of the first triode, the collector electrode of the second triode connects the source electrode of the first field effect transistor, supply the secondary current limliting element circuit of circuit structure with identical for the elementary current limliting element circuit of circuit structure.
Described overcurrent buffer cell comprises inductance, and the first end of inductance connects the output for the secondary current limliting of circuit unit, two fly-wheel diodes of inductance in parallel, and the second end of inductance connects the intrinsic safety end.
Described signal output unit comprises the 3rd diode and the 4th diode of first group of series connection, and the negative electrode of the 3rd diode connects non-intrinsic safety end, the anodic bonding intrinsic safety end of the 4th diode; The 5th diode and the 6th diode of second group of series connection, the negative electrode of the 5th diode connects non-intrinsic safety end, the anodic bonding intrinsic safety end of the 6th diode.
The described first dual current limliting unit comprises current limliting unit front stage circuits and current limliting unit secondary circuit, current limliting unit front stage circuits comprises the 3rd triode, the collector electrode of the 3rd triode connects the intrinsic safety end, the base stage of the 3rd triode is by the 4th grounding through resistance, the emitter of the 3rd triode connects the first end of the 3rd sample resistance, the second end of anodic bonding the 3rd sample resistance of the 7th diode of two series connection and the 7th diode of the 8th diode, the negative electrode of the 8th diode connects the base stage of the 3rd triode; The circuit structure of current limliting unit secondary circuit is identical with current limliting unit front stage circuits circuit structure.
Described the first voltage regulation unit comprises the second fuse, the first end of the second fuse connects the output of current limliting unit secondary circuit, the second end of the second fuse connects non-intrinsic safety end, the voltage stabilizing didoe that also comprises three groups of parallel connections, every group of voltage stabilizing didoe that comprises two anode docking, the equal ground connection of one end negative electrode of each voltage stabilizing didoe group, other end negative electrode all connects the first end of the second fuse.
The information that the present invention receives by dual Voltage stabilizing module and dual current limliting module protection intrinsic safety termination is safe energy, when if wherein a road hinders cisco unity malfunction for some reason, another road or two-way still can normally move, non-intrinsic safety terminal voltage is stabilized in below safe voltage, guarantees that dangerous energy can not enter the intrinsic safety equipment that danger is gone; Simultaneously, the present invention goes for AC/DC intrinsically safe circuit output equipment, also is applicable to high-power intrinsically safe circuit output equipment, compact conformation, and output accuracy improves, and components and parts are not fragile, reduce potential safety hazard, increase work efficiency.
The accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present invention;
Fig. 2 is circuit theory diagrams of the present invention.
Embodiment
As shown in Figure 1, the present invention includes voltage stabilizing power supplying circuit and signal delivery circuit, voltage stabilizing power supplying circuit is mainly used in as intrinsic safety end equipment provides electric energy, and the signal delivery circuit is mainly used in from the intrinsic safety end to non-intrinsic safety end output signal, for exporting direct current signal and AC signal; Voltage stabilizing power supplying circuit comprises for the circuit voltage regulation unit, output for the circuit voltage regulation unit connects the input for the dual current limliting of circuit unit, the input that connects the overcurrent buffer cell for the output of the dual current limliting of circuit unit, the output of overcurrent buffer cell connects the intrinsic safety end; The signal delivery circuit comprises signal output unit and back flow protection unit; the input of signal output unit connects the intrinsic safety end; the output of signal output unit connects non-intrinsic safety end; the back flow protection unit comprises the first back flow protection circuit and the second back flow protection circuit; the first back flow protection circuit comprises the first dual current limliting unit; the first dual current limliting unit connects non-intrinsic safety end by the first voltage regulation unit, and the circuit structure of the second back flow protection circuit is identical with the circuit structure of the first back flow protection circuit.
As shown in Figure 2, be circuit theory diagrams of the present invention:
Non-intrinsic safety end the first terminal 1 is voltage stabilizing power supplying circuit with intrinsic safety end the first terminal 4.For the circuit voltage regulation unit, by the first fuse F1 and voltage stabilizing didoe D1, D2, D3, formed, the first end of the first fuse F1 connects non-intrinsic safety end, the second end connects voltage stabilizing didoe D1, the D2 of three parallel connections, the negative electrode of D3, voltage stabilizing didoe D1, the D2 of three parallel connections, the plus earth of D3, for the dual current limliting of circuit unit, comprise for circuit elementary current limliting unit with for the secondary current limliting of circuit unit, comprise the first sample resistance R1 for the elementary current limliting of circuit unit, the first end of the first sample resistance R1 connects the second end of the first fuse F1, the second end of the first sample resistance R1 connects the emitter of the first triode Q9, the base stage of the first triode Q9 is by the first resistance R 15 ground connection, the first diode D24 and the second diode D25 series connection, the first end of anodic bonding the first sample resistance R1 of the first diode D24, the negative electrode of the second diode D25 connects the base stage of the first triode Q9, the collector electrode of the first triode Q9 connects the grid of the first field effect transistor Q2 by the second sample resistance R2, the source electrode of the first field effect transistor Q2 is by the second resistance R 7 ground connection, the base stage of the second triode Q1 connects the second end of the second sample resistance R2 by the 3rd resistance R 3, the emitter of the second triode Q1 connects the collector electrode of the first triode Q9, the collector electrode of the second triode Q1 connects the source electrode of the first field effect transistor Q2, supply the secondary current limliting element circuit of circuit structure with identical for the elementary current limliting element circuit of circuit structure, the overcurrent buffer cell comprises inductance L, and the first end of inductance L connects the output for the secondary current limliting of circuit unit, inductance L two sustained diode 32 in parallel, D33, and the second end of inductance L connects intrinsic safety end the first terminal 4.
Voltage stabilizing power supplying circuit operation principle: during normal operation, voltage stabilizing didoe D1, D2, D3 are stabilized in supply voltage below the maximum output voltage value of this intrinsic safety associate device setting, when the voltage entered from non-intrinsic safety end the first terminal 1 during higher than voltage stabilizing didoe D1, D2, D3 maximum voltage voltage stabilizing didoe puncture, electric current increases rapidly, first fuse F1 moment fused, circuit is disconnected, reach the effect that dangerous voltage enters the intrinsic safety end in addition of restriction intrinsic safety equipment.In the selection of components and parts, during the voltage stabilizing didoe normal operation, power should be in its below 2/3 of rated power, that is to say that the voltage stabilizing didoe power rating should be at least the rated current that 1.7In(In is fuse) the highest Zener voltage that is multiplied by voltage stabilizing didoe is multiplied by 1.5 times again, usually select 1N series, its single tube rated power is 5W.In circuit, the time-current characteristic of fuse should guarantee to be no more than the transient state rated value of voltage stabilizing didoe, it should think 1500A at the prospective current of 250V electrical network, the breaking capacity of fuse should be not less than this prospective current, usually select the ceramic fuses such as littlefuse (being fuse) of the U.S., if select general glass fuse, need limit prospective current get off with the metal thin film resistor of 10 ohm of 1w.
For the dual current limliting of circuit unit, for primary circuit current limliting unit, be example, during the circuit normal operation, electric current I is by coming for the circuit voltage regulation unit, the first sample resistance R1 flows through, the first triode Q9, the second sample resistance R2, after the first field effect transistor Q2, flow in next unit, the first diode D24 now, the second diode D25 and second not conductings of triode Q1, when electric current I is flowed through the first sample resistance R1 over the maximum output current value of intrinsic safety associate device setting, the first sample resistance R1 both end voltage adds that the Ueb voltage sum of the first triode Q9 is greater than 1.4V, quick break-make the first diode D24 now, the rapid conducting of the second diode D25, large electric current is switched to the first diode D24 by original path, the second diode D25, the first resistance R 15 flows into the earth, if at the first diode D24, the second diode D25 not during conducting electric current I continue to raise, when it flows through the second sample resistance R2, the two ends pressure drop can surpass 0.7V, the rapid conducting of the second triode Q1, the second triode Q1 increases and enters saturation condition with electric current, now between the collector electrode of the second triode Q1 and emitter-base bandgap grading voltage drop to 0.3V, the first field effect transistor Q2 turn-offs, circuit disconnects, play the effect that stops dangerous large electric current to flow into.In this unit, the first diode D24, the second diode D25, the first sample resistance R1, the first triode Q9 has formed a road current limliting, the second sample resistance R2, the second triode Q1 and the first field effect transistor Q2 have formed another road current limliting, inside, a current limliting unit is provided with the two-way current limliting, this is because quick break-make the first diode D24, the second diode D25 and the second triode Q1, the first field effect transistor Q2 is from having a reaction time by the end of saturated, during this period of time electric current I continues to rise, the energy that flows into hazardous area can surpass the energy that GB3836.4 allows, whether can set off an explosion and just can't judge theoretically, can only judge by the sparking test of the 10.1st of GB3836.4, spark test proves many times, when selecting one of them current-limiting circuit, the electric current that the last Limited Current peakedness ratio of electric current I is set is high, finally tend to ignite hazardous gas, and when two current-limiting circuit strings together during dual current limliting, by repeatedly constantly in Circuit tuning the parameter of each components and parts make the first diode D24, the second diode D25 and the second triode Q1, the reaction time of the first field effect transistor Q2 is as far as possible little, the peak current that finally flows into intrinsic safety equipment is no more than 1.5 times that set electric current, just hazardous gas can not ignited in spark test like this.For the secondary current limliting element circuit of circuit structure, with identical for the elementary current limliting element circuit of circuit structure, do not repeat them here.
The overcurrent buffer cell is comprised of solid-state inductance device L and two sustained diode 32, D33, and it is in order to cushion the electric current that in the current limliting unit, field effect transistor and triode increased in the reaction time, to make its peak value step-down, being conducive to the normal operation of intrinsically safe circuit.When normal operation, this unit can play good buffer current effect, but GB3836.4 regulation inductance is non-infallible component, and when suddenling change, inductive current can produce spark, lower so nonserviceable is the inductance L afterflow with sustained diode 32, D33, prevent from lighting hazardous gas, and now this unit is equivalent to short circuit, can not play the effect of buffer current.
Non-intrinsic safety end the second terminal 2 and the 3rd non-intrinsic safety end the 3rd terminal 3 are the signal delivery circuit with intrinsic safety end the second terminal 5 and the 3rd intrinsic safety end the 3rd terminal 6, comprise signal output unit and back flow protection unit, signal output unit comprises the 3rd diode D20 and the 4th diode D21 of first group of series connection, the negative electrode of the 3rd diode D20 connects anodic bonding intrinsic safety end the second terminal 5 of non-intrinsic safety end the second terminal 2, the four diode D21; The 5th diode D22 and the 6th diode D23 of second group of series connection, the negative electrode of the 5th diode D22 connects anodic bonding intrinsic safety end the 3rd intrinsic safety end the 3rd terminal 6 of non-intrinsic safety end the 3rd terminal 3, the six diode D23 of non-intrinsic safety end the 3rd.The first back flow protection circuit comprises the first dual current limliting unit, the first dual current limliting unit comprises current limliting unit front stage circuits and current limliting unit secondary circuit, current limliting unit front stage circuits comprises the 3rd triode Q6, the collector electrode of the 3rd triode Q6 connects intrinsic safety end the second terminal 5, the base stage of the 3rd triode Q6 is by the 4th resistance R 10 ground connection, the emitter of the 3rd triode Q6 connects the first end of the 3rd sample resistance R12, the second end of anodic bonding the 3rd sample resistance R12 of the 7th diode D30 of two series connection and the 7th diode D30 of the 8th diode D31, the negative electrode of the 8th diode D31 connects the base stage of the 3rd triode Q6, the circuit structure of current limliting unit secondary circuit is identical with current limliting unit front stage circuits circuit structure, the first voltage regulation unit comprises the second fuse F2, the first end of the second fuse F2 connects the output of current limliting unit secondary circuit, the second end of the second fuse connects non-intrinsic safety end the second terminal 2, the voltage stabilizing didoe that also comprises three groups of parallel connections, every group of voltage stabilizing didoe that comprises two anode docking, the equal ground connection of one end negative electrode of each voltage stabilizing didoe group, other end negative electrode all connects the first end of the second fuse F2.
As shown in Figure 2, the intrinsic safety signal flows into non-intrinsic safety end the second terminal 2 access external circuits from intrinsic safety end the second terminal 5 through signal output unit, perhaps from intrinsic safety end the 3rd intrinsic safety end the 3rd terminal 6, through signal output unit, flow into non-intrinsic safety end the 3rd terminal 3 access external circuits of non-intrinsic safety end the 3rd, this is independently signal output channels of two-way, when signal is exported from intrinsic safety equipment, itself is exactly safe energy, not needing again it to be limited to energy is pressure limiting and current limliting, can directly by wire, export, in order to prevent dangerous energy, from intrinsic safety associate device outside, by this passage anti-channeling, return, after two diodes of serial connection, energy just can only outbound flow and can not anti-channeling return from intrinsic safety equipment, intrinsic safety equipment is exactly safe like this.
When signal is interchange, when intrinsic safety end the second terminal 5 be+, intrinsic safety end the 3rd terminal 6 for-time, the AC signal output channel is that the intrinsic safety output current flows into signal output unit to non-intrinsic safety end the second terminal 2 from intrinsic safety end the second terminal 5, enter non-intrinsic safety end the 3rd terminal 3 of non-intrinsic safety end the 3rd through external equipment, flow into intrinsic safety end the 3rd intrinsic safety end the 3rd terminal 6 through the second voltage regulation unit, the second dual current limliting unit again, then enter intrinsic safety equipment formation loop.In this path, when signal flows to external equipment from intrinsic safety end the second terminal 5, electric current is the safe energy flowed out from intrinsic safety equipment, do not need limit directly to get final product by signal output unit, but when signal passes back into intrinsic safety equipment from external equipment again, once external equipment breaks down, dangerous voltage and large electric current can flow to intrinsic safety end the 3rd terminal 6 from non-intrinsic safety end the 3rd terminal 3 and flow into intrinsic safety equipment, at this moment just need Dui Zhe road signal to be limited energy by the second voltage regulation unit, the second dual current limliting unit.
Wherein the first voltage regulation unit and the second voltage regulation unit are identical circuit unit triple modular redundant, and wherein each unit is that double voltage stabilizing tube anode-anode docking forms, and ac voltage signal can be passed through in the two ends of voltage regulation unit like this, the first current limliting unit and the second current limliting unit are identical doubleization of circuit unit, one of them unit is by current-limiting resistance R13, double diode D16, D17, triode Q7 and R17 form, during normal operation, current channel is R13, Q7, when the electric current of non-intrinsic safety end the 3rd terminal 3 inflows surpasses the maximum output current of intrinsic safety associate device setting, the cut-in voltage that the Ueb voltage sum of voltage on current-limiting resistance R13 and triode Q7 is greater than two series diodes change its course by diode circuit D16 by electric current moment, D17, R17 ground connection, triode disconnects, thereby limited electric current, R13 flows through again when electric current diminishes, the Q7 passage, in this unit only by a current-limiting circuit, be because the ac output current signal of intrinsic safety equipment generally all far below source current, the set point that the upper flow unit is set in parameter is lower, electric current overcharges also can not ignite spark test apparatus, so do not need two current-limiting circuits in same unit for circuit current limliting unit.Signal output unit is that diode D20, the D21 that forward conduction voltage drop is little is composed in series, and when intrinsic safety equipment is output as direct current, electric current directly flows out by D20, D21 without other circuit.
When intrinsic safety end the 3rd terminal 6 be+, intrinsic safety end the second terminal 5 for-time, signal path is 6-3-external equipment-2-5, with intrinsic safety end the second terminal 5, be+, intrinsic safety end the 3rd terminal 6 for-path just in time contrary, but the circuit working principle is identical, does not repeat them here.
Claims (7)
1. an intrinsic safety correlator that connects non-intrinsically safe circuit and AC/DC intrinsically safe circuit, it is characterized in that: comprise voltage stabilizing power supplying circuit and signal delivery circuit, the input of voltage stabilizing power supplying circuit is for connecting non-intrinsic safety end, the output of voltage stabilizing power supplying circuit is for connecting the intrinsic safety end, the output of signal delivery circuit is for connecting non-intrinsic safety end, and the input of signal delivery circuit is for connecting the intrinsic safety end; Described voltage stabilizing power supplying circuit comprises for the circuit voltage regulation unit, output for the circuit voltage regulation unit connects the input for the dual current limliting of circuit unit, the input that connects the overcurrent buffer cell for the output of the dual current limliting of circuit unit, the output of overcurrent buffer cell connects the intrinsic safety end; Described signal delivery circuit comprises signal output unit and back flow protection unit; the input of signal output unit connects the intrinsic safety end; the output of signal output unit connects non-intrinsic safety end; the back flow protection unit comprises the first back flow protection circuit and the second back flow protection circuit; the first back flow protection circuit comprises the first dual current limliting unit; the first dual current limliting unit connects non-intrinsic safety end by the first voltage regulation unit, and the circuit structure of the second back flow protection circuit is identical with the circuit structure of the first back flow protection circuit.
2. the intrinsic safety correlator of the non-intrinsically safe circuit of connection according to claim 1 and AC/DC intrinsically safe circuit, it is characterized in that: the described circuit voltage regulation unit that supplies comprises the first fuse, the first end of the first fuse connects non-intrinsic safety end, the second end connects the negative electrode of the voltage stabilizing didoe of three parallel connections, the plus earth of the voltage stabilizing didoe of three parallel connections.
3. the intrinsic safety correlator of the non-intrinsically safe circuit of connection according to claim 2 and AC/DC intrinsically safe circuit, it is characterized in that: the described dual current limliting of the circuit unit that supplies comprises for circuit elementary current limliting unit with for the secondary current limliting of circuit unit, comprise the first sample resistance for the elementary current limliting of circuit unit, the first end of the first sample resistance connects the second end of the first fuse, the second end of the first sample resistance connects the emitter of the first triode, the base stage of the first triode is by the first grounding through resistance, the first diode and the series connection of the second diode, the first end of anodic bonding first sample resistance of the first diode, the negative electrode of the second diode connects the base stage of the first triode, the collector electrode of the first triode connects the grid of the first field effect transistor by the second sample resistance, the source electrode of the first field effect transistor is by the second grounding through resistance, the base stage of the second triode connects the second end of the second sample resistance by the 3rd resistance, the emitter of the second triode connects the collector electrode of the first triode, the collector electrode of the second triode connects the source electrode of the first field effect transistor, supply the secondary current limliting element circuit of circuit structure with identical for the elementary current limliting element circuit of circuit structure.
4. the intrinsic safety correlator of the non-intrinsically safe circuit of connection according to claim 3 and AC/DC intrinsically safe circuit, it is characterized in that: described overcurrent buffer cell comprises inductance, the first end of inductance connects the output for the secondary current limliting of circuit unit, two fly-wheel diodes of inductance in parallel, the second end of inductance connects the intrinsic safety end.
5. the intrinsic safety correlator of the non-intrinsically safe circuit of connection according to claim 4 and AC/DC intrinsically safe circuit, it is characterized in that: described signal output unit comprises the 3rd diode and the 4th diode of first group of series connection, the negative electrode of the 3rd diode connects non-intrinsic safety end, the anodic bonding intrinsic safety end of the 4th diode; The 5th diode and the 6th diode of second group of series connection, the negative electrode of the 5th diode connects non-intrinsic safety end, the anodic bonding intrinsic safety end of the 6th diode.
6. the intrinsic safety correlator of the non-intrinsically safe circuit of connection according to claim 5 and AC/DC intrinsically safe circuit, it is characterized in that: the described first dual current limliting unit comprises current limliting unit front stage circuits and current limliting unit secondary circuit, current limliting unit front stage circuits comprises the 3rd triode, the collector electrode of the 3rd triode connects the intrinsic safety end, the base stage of the 3rd triode is by the 4th grounding through resistance, the emitter of the 3rd triode connects the first end of the 3rd sample resistance, the second end of anodic bonding the 3rd sample resistance of the 7th diode of two series connection and the 7th diode of the 8th diode, the negative electrode of the 8th diode connects the base stage of the 3rd triode, the circuit structure of current limliting unit secondary circuit is identical with current limliting unit front stage circuits circuit structure.
7. the intrinsic safety correlator of the non-intrinsically safe circuit of connection according to claim 6 and AC/DC intrinsically safe circuit, it is characterized in that: described the first voltage regulation unit comprises the second fuse, the first end of the second fuse connects the output of current limliting unit secondary circuit, the second end of the second fuse connects non-intrinsic safety end, the voltage stabilizing didoe that also comprises three groups of parallel connections, every group of voltage stabilizing didoe that comprises two anode docking, the equal ground connection of one end negative electrode of each voltage stabilizing didoe group, other end negative electrode all connects the first end of the second fuse.
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| CN106532914A (en) * | 2016-11-28 | 2017-03-22 | 国网河南省电力公司商丘供电公司 | Dual-switching uninterrupted power supply device |
| CN111025123A (en) * | 2019-11-21 | 2020-04-17 | 南阳防爆电气研究所有限公司 | Spark test equipment and use method thereof, and method for optimizing non-intrinsic safety circuit into intrinsic safety circuit |
| CN114844519A (en) * | 2022-04-06 | 2022-08-02 | 杭州海康威视数字技术股份有限公司 | Isolating device for intrinsic safety circuit and non-intrinsic safety circuit |
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| CN201106455Y (en) * | 2007-12-07 | 2008-08-27 | 煤炭科学研究总院重庆研究院 | Flame proof and essence safe type signal isolater for coal mine |
| CN201188584Y (en) * | 2008-05-05 | 2009-01-28 | 煤炭科学研究总院重庆研究院 | Large-capacity essential safety power supply for coal mine |
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| CN203504133U (en) * | 2013-09-26 | 2014-03-26 | 南阳防爆电气研究所有限公司 | Intrinsic safety association device for connecting non-intrinsic safety circuit and alternating current/direct current intrinsic safety circuit |
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| CN111025123A (en) * | 2019-11-21 | 2020-04-17 | 南阳防爆电气研究所有限公司 | Spark test equipment and use method thereof, and method for optimizing non-intrinsic safety circuit into intrinsic safety circuit |
| CN111025123B (en) * | 2019-11-21 | 2021-09-28 | 北方工业大学 | Spark test equipment and use method thereof, and method for optimizing non-intrinsic safety circuit into intrinsic safety circuit |
| CN114844519A (en) * | 2022-04-06 | 2022-08-02 | 杭州海康威视数字技术股份有限公司 | Isolating device for intrinsic safety circuit and non-intrinsic safety circuit |
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Effective date of registration: 20220119 Address after: 473003 No. 1 Industrial Park, high tech Zone, Nanyang City, Henan Province Patentee after: Nanyang Zhongtian explosion proof Electric Co.,Ltd. Address before: 473008 No. 20 Zhongjing North Road, Nanyang, Henan Patentee before: NANYANG EXPLOSION PROTECTED ELECTRICAL APPARATUS RESEARCH INSTITUTE Co.,Ltd. |